Virtual hosting in Apache allows a single instance of the Apache software to host more than one distinct web site. Since only one instance of Apache can use port 80 on a server at once, without virtual hosting each new web site you hosted would need a new server.
Sites hosted under virtual hosting appear to end users as normal sites in every way; the only difference is that fewer server machines are needed to host them. Virtual hosting is commonly used by high-volume low-price web hosting companies, who give each of their customers a virtual host, with potentially hundreds of customers sharing the same server.
To add a virtual host, edit
<VirtualHost MyIP:80> ServerAdmin firstname.lastname@example.org DocumentRoot /home/site1/public_html ServerName site1.com ServerAlias www.site1.com </VirtualHost> <VirtualHost MyIP:80> ServerAdmin email@example.com DocumentRoot /home/site2/public_html ServerName site2.com ServerAlias www.site2.com AccessLog /home/site2/access.log ErrorLog /home/site2/error.log <Directory /home/site2/public_html> AllowOverride All </Directory> </VirtualHost>